Well I wasn't exactly overwhelmed there with responses...
But we figured it out. The "getting started" post shows an example with the mouse controller, where only the first mouse controller is polled. We had done the same thing with the keyboard controller, and this works on most computers. But on some systems the first keyboard controller is not the correct controller, and no events come through.
Now we're checking all controllers, and things are working fine. We may make a change to detect which controller is active, and stop polling the other keyboard controllers.


